JP2003178457A - Optical disk recording method, optical disk recording device and optical disk reproducing device - Google Patents

Optical disk recording method, optical disk recording device and optical disk reproducing device

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Publication number
JP2003178457A
JP2003178457A JP2001376433A JP2001376433A JP2003178457A JP 2003178457 A JP2003178457 A JP 2003178457A JP 2001376433 A JP2001376433 A JP 2001376433A JP 2001376433 A JP2001376433 A JP 2001376433A JP 2003178457 A JP2003178457 A JP 2003178457A
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JP
Japan
Prior art keywords
recording
hologram
recorded
hologram recording
area
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2001376433A
Other languages
Japanese (ja)
Other versions
JP4162886B2 (en
JP2003178457A5 (en
Inventor
Hideyoshi Horigome
Shoji Kinoshita
Hozumi Tanaka
Takao Yamamoto
秀嘉 堀米
隆夫 山本
昌治 木下
穂積 田中
Original Assignee
Optware:Kk
株式会社オプトウエア
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Filing date
Publication date
Application filed by Optware:Kk, 株式会社オプトウエア filed Critical Optware:Kk
Priority to JP2001376433A priority Critical patent/JP4162886B2/en
Publication of JP2003178457A publication Critical patent/JP2003178457A/en
Publication of JP2003178457A5 publication Critical patent/JP2003178457A5/ja
Application granted granted Critical
Publication of JP4162886B2 publication Critical patent/JP4162886B2/en
Application status is Expired - Fee Related legal-status Critical
Anticipated expiration legal-status Critical

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Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk recording method by which holograms can be continuously recorded and reproduced with at ultra-high density, an optical disk recording device and an optical disk reproducing device. <P>SOLUTION: In recording the holograms in hologram recording regions 7, hologram recording spots HSP to be recorded on one track of the regions 7 and hologram recording spots HSP to be recorded on a track adjacent thereto are recorded in positions different in a circumferential direction. At least one hologram recording spot HSP is recorded in the respective tracks and the process is made continuous. When the diameter of the hologram recording spots HSP is defined as D and the multiple number of the adjacent hologram recording spots HSP as (m), these recording spots are so recorded that the pitch P between the recording spots HSP attains P=D/m. The holograms can therefore be efficiently recorded in the recording regions 7 of the optical disk recording medium 1 at the high density and the higher density of the hologram recording capacity can be attained. <P>COPYRIGHT: (C)2003,JPO

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION The present invention is directed to
Hologram between multiple servo areas and each servo area at intervals
Optical disc using an optical disc recording medium having a
Disk recording method, optical disk recording device, and optical disk reproduction
Regarding equipment, in particular, ultra-high density information using holography
Optical disk recording method for continuous recording and playback
Method, optical disk recording device and optical disk reproducing method
You. [0002] 2. Description of the Related Art Conventionally, holograms have been used for optical discs.
Holographic recording of information at ultra-high density
A known recording method is known. This holographic record
In the method, information light carrying image information and reference for recording
Interference fringes by superimposing light inside the optical disk recording medium
A pattern is generated, and this interference fringe pattern is recorded on an optical disc.
Write image information by recording in recording media
Is done. Reproduce information from recorded fringe pattern
Recorded on the optical disk recording medium,
Irradiates the same interference reference pattern as when writing
And cause diffraction by the interference fringe pattern
Play information. In recent years, the recording layer of an optical disc recording medium has
Write interference fringe pattern three-dimensionally using thickness direction
To further increase the recording density
The development of volume holography is drawing attention. this
Using the recording method by volume holography,
Dramatically increase information recording capacity by performing multiplex recording
Can be increased. [0004] By such volume holography
Apparatus and apparatus for recording and reproducing information on and from an optical disc recording medium
And its method is described in International Publication No. WO 99/44195.
It has been disclosed. In order to understand the present invention,
Recording / playback device using volume holography described in
The configuration of the device will be briefly described. As shown in FIG.
In addition, the optical disk recording medium 101 has a circular transparent substrate 10.
A hologram recording layer 101c is provided between 1a and 101b.
And opposite to the recording layer 101c of the transparent substrate 101b.
A reflection film 101d is formed on the surface on the side
e, and the optical film is
Address servos in the radial direction of the disk recording medium 101
These areas are arranged at predetermined angular intervals and are arranged in the circumferential direction.
An information recording area is provided between the address servo areas.
I have. Focus servo control in the address servo area
And information for performing tracking servo control
The address information for the recording area
Recorded. Perform tracking servo control
For example, use wobble pits as information for
be able to. As a specific configuration of an optical disk recording medium,
Means that the transparent substrates 101a and 101b are, for example, 0.6 mm
The hologram recording layer 101c having the following appropriate thickness
Has an appropriate thickness of, for example, 10 μm or more. E
The program recording layer 101c is irradiated with laser light for a predetermined time.
The refractive index, the dielectric constant, and the
Hologram recording materials with variable optical characteristics such as reflectance and reflectance
Thus, for example, manufactured by Dupont
Photopolymers HRF-600 (manufactured by
Product name) is used. Hologram by volume holography
As an example of recording on the recording layer, as shown in FIG.
Information beam 111 carrying information to be recorded and reference beam 112 for recording
In the hologram recording layer 103 in the thickness direction.
The information light 1 is transmitted from the transparent substrate 102 side so as to generate interference fringes.
11 and the recording reference light 112 are simultaneously irradiated for a predetermined time.
To form a three-dimensional interference fringe pattern in the hologram recording layer 103.
Information is transformed into a three-dimensional hologram
And record. [0007] By the way, a disc-shaped light
General information for optically recording information on disc recording media
In order to achieve high-density recording using a recording device,
The track pitch of the information recording area of the disc recording medium
Holographic recording
In the case of, the track pitch (for example, 0.8 μm)
The interference region of the hologram in the hologram recording layer
(Hologram recording spot) area (for example, φ500μ)
m) is large, and to achieve high density,
It is necessary to perform such multiple recording. Usually, as shown in FIG.
As shown in FIG.
System recording spot so that it partially overlaps the adjacent spot
Recording is performed with a slight shift in the horizontal direction.
In such multiplex recording, the hologram recording spot
Is the diameter of the hologram recording spot and P is the pitch between the hologram recording spots.
Then, the multiplex number m is m = D / P. However, in the multiplex recording described above,
Is the diffraction efficiency in proportion to the square of the multiplex number m of the hologram.
(Reproduction light intensity) is reduced, so that recording density is improved and reproduction
Considering the securing of light intensity, find the optimal multiplex number in advance and
Of the hologram recording spot on the recording layer based on the
Need to decide. Even in this case, the determined holog
The pitch (P) of the ram recording spot itself is
Larger than the track pitch of the information recording area of the recording medium
(For example, 20 μm). For this reason, it was decided as it was
Hologram is hologram at hologram recording spot pitch P
When writing continuously to the gram recording layer 103, a certain track
Can be recorded on a track but cannot be recorded on other tracks
Such burst recording is performed.
Hologram recorded in a burst like this
Is difficult to reproduce continuously. The present invention has been made in view of such circumstances.
The hologram is recorded and re-recorded continuously at a very high density.
Optical disk recording method and optical disk recording
Recording apparatus and an optical disk reproducing apparatus.
I do. [0010] An optical disk according to the present invention is provided.
The recording method of the recording medium is as follows.
Tracking servo, focus servo and clock
Servo areas for generating the servo are formed discretely, and
Hologram, which is a mirror area when not recorded,
A ram recording area is formed, and the hologram recording area
Are information light and recording reference light emitted from the optical head.
The interference pattern due to interference with the
The recording method of an optical disk recording medium,
Hologram recorded on one track of gram recording area
Recording on the ram recording spot and the adjacent track
The hologram recording spot to be
Between adjacent hologram recording spots
The pitch P of the hologram is D,
When the number of multiplexed hologram recording spots is m, P
= D / m in the hologram recording area.
Recording the program. [0011] The recording method of the optical disk recording medium of the present invention
According to the hologram recording area to record a hologram
At the time of recording on one track of the hologram recording area.
The hologram recording spot to be recorded and the adjacent
The hologram recording spot recorded on the rack is
Each track is recorded in a different direction,
At least one hologram recording spot is formed.
The hologram recording operation and reproduction operation
It is a continuous process without the need for a system. Moreover, the present invention
According to the recording method, the diameter of the hologram recording spot is D
And the number of multiplexed hologram recording spots is m
Is equal to the pitch P between hologram recording spots adjacent to each other.
Record so as to be D / m. For this reason, optical disk storage
Hologram with high density and high efficiency in the hologram recording area of the recording medium
RAM can be recorded, and the hologram recording capacity is high
Accuracy can be improved. [0012] The above recording method includes a hologram.
Hologram recording recorded on one track of the recording area
Recorded on the recording spot and the adjacent track
The distance from the hologram recording spot is almost P,
A hologram recording spot recorded on the track of
Holog recorded on a track that is m tracks away from this
So that the circumferential positions of the ram recording spots are equal.
Possible to record hologram in program recording area
It is. By recording in this way, high-density recording can be achieved.
The simplification of the process can be achieved while realizing it. [0013] Further, as the above recording method, a hologram recording method is used.
Hologram recording recorded on one track of recording area
The spot and the home recorded on the adjacent track
The interval from the program recording spot is almost P,
A hologram recording spot recorded on the track;
Holographic recording recorded on tracks separated by tracks
Holo so that the circumferential position of the spot is shifted by P / 2
Holograms may be recorded in the gram recording area.
No. By recording in this way, higher density recording can be achieved.
Can be realized. In such a recording method, an optical disc is used.
The recording medium is divided into multiple zones in the radial direction,
Recorded in the circumferential direction of one hologram recording area in the peripheral zone
The number of holograms to be recorded is
Number of holograms recorded in the circumferential direction of the program recording area
Hologram in the hologram recording area so as to be more than
Is preferably recorded. This increases the recording density
Can be An optical disk recording apparatus according to the present invention has a
Tracking servo of optical head at predetermined intervals in the
Servo area for focus servo and clock generation
It is formed discretely, and between each servo area, when not recording
Indicates that a hologram recording area, which is a mirror area, is formed
The hologram recording area is emitted from the optical head.
The interference pattern between the information beam and the recording reference beam
For optical disk recording media recorded as holograms
Optical disk recording device for recording the hologram
Information of the servo area of the optical disc recording medium
Clock generation that generates a clock by reading with an optical head
Means and a clock generated by the clock generating means.
A record that determines the recording timing for each track as a reference
Recording timing generating means for generating a recording timing signal;
Wherein the recording timing generation means includes:
Hologram recorded on one track of the program recording area
It is recorded on the recording spot and the adjacent track.
Hologram recording spots at different positions in the circumferential direction
Recorded and the pitch between adjacent hologram recording spots
Switch P sets the diameter of the hologram recording spot to D,
Let m be the number of multiplexed hologram recording spots set
Then, the hologram recording area is set so that P = D / m.
To determine the recording timing of the hologram to the
There is a feature. An optical disk reproducing apparatus according to the present invention has a
Tracking servo of optical head at predetermined intervals in the
Servo area for focus servo and clock generation
The optical head is formed discretely and between each servo area.
Due to the interference between the information light emitted from the
Hologram with interference pattern recorded as hologram
Light for reproducing an optical disk recording medium with a recording area formed
In the disk reproducing apparatus, the optical disk recording medium
Reads information in the servo area with the optical head and generates a clock
Generating means for generating a clock, and the clock generating means
Playback for each track based on the clock generated in
The playback timing signal that determines the timing
Raw timing generation means;
Forming means on one track of the hologram recording area
Hologram recording spot to be recorded on
Hologram recording spot recorded on the track
Are recorded at different positions in the circumferential direction, and
The pitch P between the gram recording spots is
Hologram recording with preset recording spot diameter D
Assuming that the number of multiplexed spots is m, P = D / m.
The hologram recording area from the hologram recording area
It is important to determine the timing of pot playback.
Sign. [0017] BRIEF DESCRIPTION OF THE DRAWINGS FIG.
An embodiment of the present invention will be described. FIG. 1 shows the present invention.
Used in an optical disc recording apparatus according to an embodiment of the present invention
FIGS. 2A and 2 are diagrams for explaining a disk recording medium.
FIG. 2B is a partially enlarged view of FIG. As shown in FIG.
The plate-shaped optical disk recording medium 1 is a multi-layered optical disk divided in the circumferential direction.
Number of frames 2 (in this example, frames # 00 to # 9
7), and each of these frames 2 is further divided in the circumferential direction.
Segment 3 (in this example, segment #
00 to # 13). Each segment 3
Is the distance between the servo area 6 and a part of the adjacent servo area 6.
Except for the hologram recording area 7, the hologram recording area 7 is provided.
Between the servo areas 6 (in this example, the
Between servo area 6 and servo area 6 of segment # 01)
Is an address in which address information indicating the access position is recorded.
A relief region 8 is formed. As shown in FIGS. 2A and 2B, each servo area
6 shows various operations in the optical disk recording / reproducing apparatus.
Servo clock pit SCK as reference for timing of
1, 2, 3 and, for example, by the sampled servo method
For performing focus servo and tracking servo
The servo pits A, B, and C are
Has been recorded. Address area 8 is a preamble
8a, synchronization mark 8b, address part 8c, end address
Dress mark 8d, post synchronization mark 8e and post
It comprises an amble 8f. Hologram recording is performed in the address part 8c.
Address information for identifying area 7 is every other track
This hologram is recorded when recording a hologram.
Using the information recorded in the dress area 8,
From the optical head for the information recording position of the gram recording area 7
Of the irradiation position of the information light, recording reference light and reproduction reference light
Perform alignment. The optical disk recording / playback device
Servo clock pit SCK recorded in servo area 6
1 to 3 and servo pits A, B, C
Singing and tracking, and address area 8
Detects recorded address information and records each hologram.
Information light, recording reference light, and reproduction reference in recording area 7
The light irradiation position is adjusted. Hologram recording area 7
Has a physical format with embossed bits
There is no mirror area. FIG. 3 is an enlarged view of the optical disk recording medium 1.
FIG. Optical disk recording medium 1 is circular
A hologram recording layer 1c is provided between the transparent substrates 1a and 1b.
And the surface of the transparent substrate 1b opposite to the recording layer 1c.
A reflective film 1d is formed on the substrate, and these are bonded to a substrate 1e.
It is composed. The reflection film 1d has a segment # 00
Indicates emboss pits in the servo area 6 and the address area 8
Is preformatted as a physical format,
In the emment # 01 to # 13, the emboss
Only the pre-format as a physical format.
Have been. Thus one of the 14 segments
Only the segment of the physical format of the address information
Used for recording holograms by using
Mirror area can be as large as possible.
You. In the hologram recording area 7, a hologram having a diameter D is recorded.
The recording spot HSP partially overlaps the adjacent spot HSP
The pitch is recorded in the horizontal direction with a shift of P,
More multiplex recording is realized. As a specific configuration of the optical disk recording medium,
Means that the thicknesses t1 and t3 of the transparent substrates 1a and 1b are, for example,
0.6 mm or less, the thickness t2 of the hologram recording layer 1c
Is set to, for example, 10 μm or more. hologram
When the recording layer 1c is irradiated with laser light for a predetermined time,
Depending on the intensity of the laser light, the refractive index, dielectric constant,
Formed by hologram recording materials whose optical properties change
For example, photopoly manufactured by Dupont
(Photopolymers) HRF-600 (product name)
Used. Next, the servo area 6 and the address area 8
The physical format will be described in detail. FIG. 2A and
As shown in FIG. 2B, the servo clock pit
Pits A, B, and C are formed at both ends of the formation area,
Servo clock pit SCK1 formed at one end
Is the servo formed at one end in the track direction and the other end
Clock pits SCK2 and SCK3 are linked in the track direction.
Subsequently, two are formed. This is to track direction
Determines directionality to enable bidirectional readout
Servo clock pits SCK1, SCK2, SC
The number of formed K3 is different. Like this
Forming voclock pits SCK1, SCK2, SCK3
The servo clock due to the difference in the reading direction.
The read direction because the
it can. This is necessary for performing the tracking servo processing described later.
Is a necessary function. In the optical disk recording medium 1 of this embodiment,
Forms a track between these embossed pits.
Arrangement of servo clock pits SCK1 to 3 in the radial direction
H is equal to the track pitch (eg, 0.8 μm)
This corresponds to the spatial frequency (λ / 2N) of MTF = 0 shown in FIG.
A) is set. This allows the servo
The clock pit is optically formed in one groove in the radial direction.
What position the light beam looks at when tracking starts
However, this can be detected. Note that this
The points are the preamble 8a of the address area 8 and the sync mark.
8b, end address mark 8d, post synchronization mark
The same applies to 8e and post amble 8f. Servo pits A, B, and C are sampled
This implements the servo. That is, as shown in FIG.
The servo pit A 'formed at the on-track position
And servo pits located on the left and right in the track traveling direction
Attempt to perform sampled servo with B 'and C'
And pits A ', B', and C 'are halved track pitches
(TP) must be formed, which increases the manufacturing cost
On the other hand, the method according to the present embodiment is as shown in FIG.
All pits are formed between tracks
And two on-track pairs of adjacent pits
Since the position is detected, the pit formation accuracy is
Pitch (TP), which reduces manufacturing costs
can do. In FIG. 2A, a light beam spot S
If P is on-track on track A (A-Tr)
In this case, the light beam spot SP is first
Pit A and then pits B and C one by one.
Detection, the first detection signal is output as shown in FIG.
Signal RFA is the largest, and the second and third detection signals RF that follow
B, amplitude where RFC is smaller than RFA but almost equal
It becomes. Therefore, in this case, detection of small amplitude
The peak values of the signals RFB and RFC are used as sample and hold.
The tracking error signal is obtained by subtracting
TE is obtained. Next, the address part 8c will be described.
You. In the address part 8c, one track of address information is stored.
It is recorded every other week. FIG. 7 shows each track and each
An arrangement relationship between a frame and address information is shown.
As shown in this figure, the address information is an odd track.
(Exactly outside the odd track)
Recorded on the even track (exactly
Side), it is recorded in an even frame. Address information
Is, for example, 2-byte track number information and 1-byte
And frame number information. Odd track access
Some track information is stored in the address area 8 of the odd-numbered frame.
Information and frame information, but address of even frame
Track information 8 refers to only the frame information and
No information is referenced. Similarly, even track access
Includes track information from the address area 8 of the even frame.
And the frame information, but the address of the odd frame
The track information is referred to only from the information 8 by referring to the frame information.
No information is referenced. To perform such address reference
When the track density reaches the spatial frequency of MTF = 0,
Can reduce the spatial frequency in the radial direction,
Address reference can be performed without any trouble. Next, the hologram to the hologram recording area 7
Explanation of the system recording format (logical format)
I do. FIG. 8 illustrates a hologram recording format.
FIG. The circles shown in the figures are for convenience of explanation.
The center of the recording position of the hologram recording spot is shown.
So, it does not represent the hologram recording spot
Need attention. As shown in FIG.
The radius D of the recording spot HSP is equal to the track pitch TP (this
Is very large compared to 0.8 μm). Right now
The radius D of the program recording spot HSP is 500 μm.
If the multiplex number m is 25, the hologram recording spot
The recording pitch P of the HSP is D / m = 20 μm. I
Therefore, one track continuously at 20 μm pitch
After the hologram recording spot HSP is formed,
Possible tracks are tracks 25 tracks ahead.
In this case, continuous recording / reproduction becomes impossible. Therefore, in this embodiment, one track
After the hologram recording spot HSP is formed on the
In the track, the track direction is equal to the pitch P (= 20 μm).
The hologram recording spot HSP is recorded at a position shifted in the direction
I do. This is sequentially repeated, and the track ahead of m (= 25) tracks is
On the track, holog at the same radial position as the first track
A ram recording spot HSP is formed. This allows each
The rack must have at least one hologram recording
Record or play back, so continuous processing is possible.
Will be able to. FIG. 9 shows recording for giving timing at the time of recording.
Shows a pulse. Servo clock pitch of servo area 6
Based on the servo clock CK reproduced from the SCK1
, And written in tracks # 00, # 01,.
Stagger the loading timing. The amount of this deviation
H. FIG. 10 shows a hologram recording format.
It is a figure showing other embodiments. In this embodiment, the radius
The hologram recording spot row adjacent in the direction is about P / 2
They are staggered. By arranging in this way
Enables higher density arrangement of hologram recording spots
become. Note that, as shown in FIG.
The recording medium 1 includes, for example, a plurality of zones ZA, Z in the radial direction.
B and ZC are formed and recorded in each zone ZA, ZB and ZC.
Hologram recording spots HSP
N1, n2, n3 (where n1 <n2
You may make it change like <n3). like this
The arrangement further improves the recording density. FIG. 12 shows a light beam according to an embodiment of the present invention.
Block schematically showing the configuration of a disc recording / playback apparatus
FIG. The optical disk recording / reproducing device 10
A spindle 41 to which the recording medium 1 is attached,
A spindle motor 42 for rotating a spindle 41,
In order to keep the rotation speed of the optical disc recording medium 1 at a predetermined value.
Spindle servo circuit for controlling spindle motor 42
43. Also, an optical disk recording / reproducing device
10 is an information light and recording medium for the optical disc recording medium 1.
A hologram is irradiated on the hologram recording area 7 by irradiating with the reference light.
And an optical disk on which a hologram is recorded
The reproduction light is detected by irradiating the recording medium 1 with the reproduction reference light.
To the hologram recording area 7 of the optical disc recording medium 1.
To recover the original information from the recorded hologram
Optical head 40 and the optical head 40
A drive device 44 for driving the medium 1 in the radial direction.
You. The optical disk recording / reproducing apparatus 10 has an optical head.
The focus error signal FE from the output signal of the
A racking error signal TE, a tracking error signal CE,
A detection circuit 45 for detecting the reproduction signal RF;
Focus error signal F detected by the detection circuit 45
E and light based on commands from the controller 50.
While the head 40 passes through the servo area 6, an optical head described later is used.
The main body is perpendicular to the plate surface of the optical disc recording medium 1.
Focus servo that moves to
Circuit 46. Also, the detection circuit 45
Tracking error signal TE detected and control
The optical head 40 performs servo control based on a command from the
While passing through the area 6, the optical head body is
Tracking servo control by moving the body 1 in the radial direction
The tracking servo circuit 47 to be performed and the detection circuit 45
Tracking error signal CE and controller 50
The optical head 40 records a hologram based on a command from the
While passing through the recording area 7, the optical head body is used for optical disc recording.
The hologram recording area 7 is moved by moving the medium 1 in the moving direction.
The information recording position is the irradiation position of the information light and the recording reference light.
Tracking servo control to follow without a fixed time delay
And a tracking servo circuit 55 for performing the tracking. In addition,
King error signal TE and frame from controller 50
The optical head 40 is controlled by controlling the driving device 44 based on the
Slide for moving the optical disk recording medium 1 in the radial direction
A slide servo circuit 48 for performing servo control and a control
The optical head 40 based on a command from the
While passing through the area 6, the optical head 40 records desired information.
And a tracking control circuit 54 for tracking the position. The optical disk recording / reproducing apparatus 10
The output data of the CCD array described later in the optical head 40 is
Decode the hologram recording area of the optical disc recording medium 1
The hologram recorded at each information recording position in the area 7 is reproduced.
Or the reproduction signal RF from the detection circuit 45
Plays back clock and supplies clock signal to controller 50
Or determine the address information of the address area 8.
Signal processing circuit 49 and the optical disk recording / reproducing device 10
Controller 50 for controlling the overall operation of the
An operation unit for giving various instructions to the trawler 50
51. Further, the optical disk recording / reproducing apparatus 10 comprises:
Optical disk recording based on output signal of signal processing circuit 49
Tilt for detecting the relative tilt between the medium 1 and the optical head body
The detection circuit 52 and the output signal of the inclination detection circuit 52
The optical head book on the plate surface of the optical disc recording medium 1
Change the position of the optical head body in the direction in which the body tilt changes.
Relative to the optical disk recording medium 1 and the optical head body.
A tilt correction circuit 53 for correcting the tilt. In the signal processing circuit 49, the tracking error
The part relating to the error detection circuit is, for example, as shown in FIG.
Is configured. Check based on servo clock CK
Of the RF signal from the output circuit 45 at the time of A, B, and C.
RFA, RF obtained by sampling / holding the peak value
B and RFC are compared with each other by a differential amplifier 61a,
61b, 61c. These differential amplifiers 61a, 61
1b, 61c output TPA, TPB, TPC
The track king error signal TE selected by the plexer 62
Is output. Each output of the differential amplifiers 61a, 61b, 61c
The polarity of the force is determined by comparators 63a, 63b, 63, respectively.
c, and these comparators 63a, 63b, 63
a logical operation circuit based on each output PA, PB, PC of c
A switch 64 controls the switching of the multiplexer 62. This
The difference between the two small peak values shown in FIG.
Is output as the tracking error signal TE. What
Note that these tracking error signals TRA, TRB,
The dynamic range of the TRC, as shown in FIG.
This is due to diffraction at the two servo pits 65,
It can be set to a larger value than the conventional optical disc,
In other words, trackers with good S / N ratio (signal to noise ratio)
The error signal TE can be obtained. In the optical disk recording / reproducing apparatus 10, a hologram
When recording a ram, the optical head 40 moves the servo area 6
While passing, move the optical head body in a direction almost along the track.
By moving, a hologram that moves for a predetermined time
The information recording position of one information recording area of the ram recording area 7 is
Information beam and recording so that the irradiation position of the reference beam for
A tracking control circuit 54 for controlling the irradiation position of the reference light is provided.
However, in the present embodiment, the information light and the recording
Irradiation position tracks information recording position more precisely and accurately
In order to perform tracking servo control as described above, the detection circuit 45
The information recording position of the hologram recording area 7 and the information light
Of the optical disk recording medium 1 with the irradiation position of the recording and reference light
The displacement in the moving direction is determined by the servo clock pit S
Irradiate CK1-3 with laser beam for tracking servo and follow
The tracking error signal C is detected as a trace error signal CE.
E, even in the hologram recording area 7, the optical head
The main body is moved in the moving direction of the optical disk recording medium 1.
Then, the tracking servo circuit 55 for performing the tracking servo
Is provided. The controller 50 controls the signal processing circuit 49
Input the servo clock CK and address information output
The optical head 40 and the spindle servo circuit 4
3, slide servo circuit 48, focus servo circuit 4
6, tracking servo circuit 47, tracking servo circuit 55
And the tracking control circuit 54 and the like.
The spindle servo circuit 43 has a signal processing circuit 49
The output basic clock is input. Controller 5
0 is a CPU (Central Processing Unit), ROM (Read On)
Re-memory) and RAM (random access memo)
And the CPU uses the RAM as a work area and the RO
By executing the program stored in M,
The function of the controller 50 is realized. Next, with reference to FIG.
System of optical head 40 of optical disk recording / reproducing apparatus
One example will be described. To the optical disk recording medium 1
Hologram recording is based on the divergence level emitted from the laser source 25.
Laser beam is focused by a lens 24 to form a laser beam.
And irradiates the laser beam with the half mirror 30a.
The laser beam is split into two laser beams, one of which is
Form an interference pattern on the modulated information light
As a recording reference beam for recording. That is, a hologram
Is recorded in the hologram recording layer 1c with the information light and the recording reference.
Form a three-dimensional interference fringe pattern by interference with illumination
The information light and the recording reference light are
Irradiate the hologram recording layer 1c of the medium 1 for a predetermined time.
And done by The information light and the recording reference light are
Information recording position of hologram recording layer 1c of disk recording medium 1
In order to irradiate one of the
The movement of the medium 1 and the movement of the irradiation position by the optical head 40
Synchronize for a predetermined time. That is, the time required for exposure is accurately synchronized with the transfer.
Need to be moved. Therefore, in this embodiment,
Indicates that servo clock pits SCK1 to 3
And these servo clock pits SCK1 to 3 are
Waves different from the wavelength of the laser beam for program recording
By irradiating with a long tracking laser beam, information can be recorded.
Misalignment between the recording position and the irradiation position of the information beam and the recording reference beam
Is detected and the hologram recording area is
7 and the irradiation position of the information light and the recording reference light
In order to accurately align and move the
Trace servo control is performed. Also recorded hologram
The reproduction of the system is a recording reference for forming an interference pattern.
Irradiate hologram recording layer 1c with reproduction reference light instead of light
It is done by doing. Further, an example of the optical system shown in FIG.
Optical head used in optical disk recording / reproducing device of embodiment
FIG. 3 is a schematic diagram illustrating the principle of the optical part of FIG.
The recording / reproducing optical system, that is, the optical head 11
An objective lens 12 facing the medium 1;
2 in the thickness direction and the radial direction of the optical disc recording medium 1.
Of the objective lens 12 with the actuator 13 for moving
On the light source side, a two-part optical rotation plate 14 is sequentially arranged from the objective lens 12.
And a prism block 15, and the two-part optical rotation plate 1
Reference numeral 4 denotes an optical rotation plate 14L disposed on the left side of the optical axis.
Optical rotation plate 14R disposed on the right side of the optical axis.
ing. The optical rotation plate 14L changes the polarization direction of the laser beam.
The optical rotation plate 14R rotates the laser beam by + 45 °.
Rotate the light direction at -45 °. Prism block 15
Are half mirrors 15a in order from the two-part optical rotation plate 14 side.
And a total reflection mirror 15b. These half mira
-15a and the total reflection mirror 15b both have normal directions.
45 ° in the same direction with respect to the optical axis of the objective lens 12
Are located. Further, beside the prism block 15,
Another prism block 19 is arranged in parallel,
The prism is opposed to the half mirror 15a of the block 15.
The total reflection mirror 19a of the block 19 is arranged in parallel.
You. Similarly, the total reflection mirror 15 of the prism block 15
b, the half mirror 1 of the prism block 19
9b are arranged in parallel. Prism block 19
Laterally, a prism having a half mirror 23a
Prism having block 23 and half mirror 30a
Blocks 30 are arranged respectively. Half mirror 15 of prism block 15
a and the total reflection mirror 19a of the prism block 19
Has a convex lens 16 and a phase spatial light modulator 17 disposed therein.
To the total reflection mirror 15b of the prism block 15.
The space between the half mirror 19b and the half mirror 19b
An interim light modulator 18 is provided. Phase spatial light modulator 1
7 has a large number of minute sections arranged in a grid,
By changing the phase of the laser beam passing through each subsection,
Configuration that can spatially modulate the phase of the passing laser beam
At the time of hologram formation or hologram reading
The reference light is generated by using a liquid crystal element.
It can be realized more easily. On the other hand, the spatial light modulator 18 is an information light generation device.
It functions as a stage, and its structure is the same as that of the optical modulator 17.
It is composed of a number of micro-compartments arranged in a
For recording the passing state and the blocking state of the laser beam
The intensity of the laser beam by choosing
Spatially modulate the light to generate information light carrying information.
And can be. This spatial light modulator 18
The liquid crystal element may be adopted similarly to the phase spatial light modulator 17.
Can be. The light source of the optical head 11 is used for recording a hologram.
Raw laser light source 25 and laser light source for tracking servo
33, and coherent light from the laser light sources 25 and 33.
Converge divergent laser light into parallel light beam to form laser beam
And collimator lenses 24 and 32, respectively.
The half-mirrors provided in the motion blocks 23 and 30 respectively
Each of the mirrors 23a and 30a has a collimator lens
45 and 32 are inclined by 45 degrees with respect to the optical axes of the lenses 24 and 32. This
Laser light source 2 passing through half mirrors 23a and 30a
A part of the projection light from 5, 33 is
6, 31 and the photo detectors 26, 31
The power automatically adjusts the light output from the light sources 25,33. Return beam from optical disk recording medium 1
Is reflected by the half mirror 23a and
A convex lens 27 provided on the side opposite to the
Through the lens 28, 4-division photodetection
And the optical head 40 moves the address servo area 6
While passing, focus error signal FE, tracking
Error signal TE is detected, and
The signal RF is derived. Focus error signal detected
FE is used for focus servo control of the optical head 40.
The tracking error signal TE used is
0 is used to perform tracking servo control. In this embodiment, the optical head 40 is a holographic head.
The tracking error signal CE is detected when passing through the
Out, to perform tracking servo control of the optical head 40,
Laser beam for tracking servo to servo clock pit
The irradiation position of the beam is the emission position of the laser light source for tracking servo.
Position according to the recording mode of the hologram.
Can be displaced from the optical axis of the
Can be. Therefore, it is supported by the laser beam for tracking servo.
Irradiates the robot clock pits SCK1 to 3 on the SCK1
-While detecting the signal CE and performing tracking servo control,
The information recording position is irradiated with a laser beam for program recording.
Thus, a hologram can be recorded. Next, the outline of the operation for recording a hologram will be described.
The abbreviation will be described. In FIG. 14, at the time of hologram recording
The spatial light modulator 18 controls each pixel according to the information to be recorded.
Transmission state (hereinafter, also referred to as “ON”) and blocking state
(Hereinafter also referred to as “off”)
The laser beam is spatially modulated to generate information light. Departure
In a clear embodiment, two pixels represent one bit of information,
Make sure that one of the two pixels corresponding to one bit of information is
On, the other off. The phase spatial light modulator 17 passes
For a laser beam, according to a predetermined modulation pattern,
A phase difference of 0 (rad) based on a predetermined phase for each pixel
Or π (rad) is selectively given,
The phase of the beam is spatially modulated to position the laser beam.
A recording reference beam whose phase is spatially modulated is generated. Con
The controller 50 selects a transformation selected by itself according to predetermined conditions.
Key pattern or modulation pattern selected by the operation unit 51
Phase information is given to the phase spatial light modulator 17 and the phase spatial light
Modulator 17 is provided by controller 50 or
Represents the information of the modulation pattern selected by the operation unit 51.
Therefore, the phase of the passing laser beam is spatially modulated.
You. The laser beam output from the laser light source 25
The system is set to a pulsed high output for recording. The control
The roller 50 is provided with a basic clock reproduced from the reproduction signal RF.
Laser beam emitted from the objective lens 12
The timing of passing through the program recording area 7 is predicted,
Light emitted from the object lens 12 passes through the hologram recording area 7
During this time, the above settings are kept. In addition, the objective lens 12
While these laser beams pass through the hologram recording area 7
Is focus servo control and tracking servo control
Is not performed and only the tracking servo control is performed. Also,
In the description, the laser light source 25 emits P-polarized light.
And As shown in FIG. 14, the laser light source 25
The P-polarized laser light emitted from the
4, the laser beam is converted into a parallel light beam,
After passing through the litter 30 and entering the beam splitter 23,
Part of the light amount passes through the half mirror 23a, and
The light enters the lock 19. Incident on the prism block 19
Part of the laser beam is reflected by the half mirror 19b.
The light passes through the spatial light modulator 18 and, at that time, is recorded.
In accordance with the information, the light is spatially modulated to become information light. This information light is transmitted through the entire prism block 15.
The half mirror 1 reflects a part of the light amount reflected by the reflecting surface 15b.
5a, and passes through the two-part optical rotation plate 14. here
And a laser that has passed through the optical rotation plate 14L of the two-part optical rotation plate 14.
A-polarized laser beam whose polarization direction is rotated + 45 °
The light that has become a beam and has passed through the optical rotation plate 14R has a polarization direction of
The laser beam is rotated by -45 ° to become a B-polarized laser beam. 2 minutes
The information light of A-polarized light and B-polarized light that has passed through the split light plate 14 is
Hologram recording layer 1c of optical disk recording medium 1 and substrate 4
To be converged on the boundary surface of
The optical disk recording medium 1 is irradiated by the lens 12
You. On the other hand, the half mirror of the prism block 19
The laser beam reflected by the -19b is reflected by the total reflection mirror 1
9a, passes through the phase spatial light modulator 17,
When the phase of light is spatially changed according to a predetermined modulation pattern,
And becomes the recording reference light. This reference light for recording
Is converged through the convex lens 16 and a part of the light amount
Is reflected by the half mirror 15a of the prism block 15.
And passes through the two-part optical rotation plate 14. Here, the optical rotation plate 14L of the two-part optical rotation plate 14
Laser beam that has passed through is rotated by + 45 °
And becomes an A-polarized laser beam, which passes through the optical rotation plate 14R.
Laser beam has its polarization direction rotated -45 ° and B-polarized
A polarized light passing through the two-segment optical rotation plate 14
The light and B-polarized recording reference light are transmitted to the optical disc recording medium 1.
At the interface between the hologram recording layer 1c and the substrate 4.
Before being converged by the objective lens 12 before
Thereafter, the light passes through the hologram recording layer 1c while diverging. Here, in order to facilitate understanding, the polarization of light
Briefly, A-polarized light is S-polarized light.
Rotate −45 ° or rotate P polarized light + 45 °
B-polarized light is S-polarized light + 45 °
Or P-polarized light rotated by -45 °
Light. Therefore, the A-polarized light and the B-polarized light
Are orthogonal. FIGS. 15 and 16 show a laser at the time of recording.
FIG. 4 is an explanatory diagram showing a state of a beam. In FIG.
The symbol denoted by 1 represents P-polarized light, and the symbol denoted by reference numeral 83
Represents A-polarized light, and the symbol denoted by reference numeral 84 represents B-polarized light.
ing. In FIG. 15, the optical rotation plate 1 of the two-part optical rotation plate 14 is shown.
The information light 71L that has passed through 4L becomes A-polarized light,
Irradiated on the optical disc recording medium 1 by the object lens 12
And passes through the hologram recording layer 1c, and on the reflection film 1d.
It converges and is reflected by the reflection film 1d, and again
Backward in the recording layer 1c. The optical rotation plate 14L of the two-part optical rotation plate 14 is
The passed recording reference light 72L becomes A-polarized light,
Irradiated on the optical disc recording medium 1 by the object lens 12
And converged once on the plane of incidence on the hologram recording layer 1c.
Thereafter, the light passes through the hologram recording layer 1c while diverging.
Then, in the hologram recording layer 1c, the reflection film 1d
Toward the A-polarized information light 71L and the reflection film 1d
Interferes with the A-polarized recording reference light 72L
A pattern is formed three-dimensionally in the hologram recording layer.
Therefore, the output of the light emitted from the laser light source 25 becomes high.
When the interference pattern is located in the hologram recording layer 1c.
It will be recorded three-dimensionally. Also, as shown in FIG.
The information light 71R that has passed through the optical rotation plate 14R of the plate 14 is B-polarized.
The light becomes light and is recorded on the optical disk by the objective lens 12.
Irradiated on the medium 1, passes through the hologram recording layer 1c,
The light converges on the reflection film 1d and is reflected by the reflection film 1d.
Then, the light travels again in the opposite direction in the hologram recording layer 1c.
Further, the recording that has passed through the optical rotation plate 14R of the two-part optical rotation plate 14
Reference light 72R becomes B-polarized light, and the objective lens 12
Irradiates the optical disk recording medium 1 with the hologram
After once converging on the incident surface of the recording layer 1c, while diverging
It passes through the hologram recording layer 1c. And hologram
In the memory recording layer 1c, the B polarization reflected by the reflection film 1d
Of the light information light 71R and the B-polarized light traveling toward the reflection film 1d.
Interference with the recording reference light 72R causes a three-dimensional interference pattern
And the output of the output light of the laser light source 25 becomes high.
When the interference pattern is located in the hologram recording layer 1c.
It is recorded three-dimensionally. The optical data of the present invention shown in FIGS.
In the hologram recording mode on the disc recording medium, the information beam
The optical axis and the optical axis of the recording reference beam are arranged on the same line.
And the information light and the recording reference light are applied to the hologram recording layer 1c.
Irradiated from the same side. In addition, the information recording area
The recording reference light is applied to the hologram recording layer 1c at the same recording position.
Multiple recording operations with different modulation patterns
With phase encoding multiplexing, information can be multiplexed and recorded.
It is possible. Thus, the optical disk recording of the present invention is performed.
In a recording device for recording a hologram on a medium,
A reflection type (Lipman type) hologram in the gram recording layer 1c.
A ram is formed. The A-polarized information light 71L and the B-polarized
Since the polarization direction is orthogonal to the light recording reference light 72R.
Similarly, the B-polarized information light 71R and the A-polarized light
The recording reference light 72L interferes with the recording reference light 72L because the polarization directions are orthogonal to each other.
Absent. That is, when recording a hologram, extra interference fringes
Generation is prevented and the SN (Signal to Noise) ratio is prevented from lowering.
There are advantages that can be. Further, in the above recording apparatus, the information light is
Hologram recording on the optical disc recording medium 1 as shown in FIG.
Irradiation is performed so as to converge at the interface between the recording layer 1c and the substrate 1e.
And reflected by the reflective film 1d of the optical disc recording medium 1,
It returns to the object lens 12 side. This return light is
In the same manner as described above.
You. Therefore, the light enters the four-segment photodetector 29.
The information servo area is used during recording by using
In 6, it is possible to perform focus servo.
You. It should be noted that the recording reference beam is the optical disc recording
On the incident surface of the hologram recording layer 1c of the recording medium 1.
Divergent light is applied to the emboss pits in the servo area 6
Is reflected by the reflection film 1d of the optical disc recording medium 1.
And return to the objective lens 12 side.
Since no image is formed on the detector 29, the focus servo
Can not be used for. In the recording apparatus, the convex lens 16 is
By moving it back and forth and changing its magnification,
In the hologram recording layer 1c, the information beam and the reference beam
Area where three interference patterns are recorded three-dimensionally (hologram
The size of the memory area can be arbitrarily selected. Next, the operation at the time of reproducing recorded information will be described again.
This will be described with reference to FIG. During playback, the spatial light modulator
All 18 pixels are turned on. Also, the controller 50
Is a reference for recording when recording the information to be reproduced.
The same information as the light modulation pattern is sent to the phase spatial light modulator 17.
And the spatial light modulator 17 is controlled by the controller 50.
According to the same information as the given modulation pattern at the time of information recording.
Spatially modulates the phase of the passing laser beam
The phase of the laser beam is spatially modulated and
Illumination is generated. The laser light emitted from the laser light source 25
The output is switched to a low output for playback and the controller
50 is a servo clock C reproduced from the reproduction signal RF.
Laser beam that has passed through objective lens 12 based on K
Predicts when will pass through hologram recording area 7
The laser beam from the objective lens 12 is holographically recorded.
During the passage through the recording area 7, the above-mentioned setting at the time of reproduction is set. Subordinate
Therefore, the laser beam from the objective lens 12 is a hologram.
During the passage through the recording area 7, focus servo control and
Tracking servo control is not performed.
It is done. As shown in FIG. 14, the laser light source 25
The P-polarized laser beam emitted from the
The laser beam is converted into a parallel light beam by the
Transmits through the splitter 30 and enters the beam splitter 23
Some of the light amount is reflected by the half mirror 23a.
Incident on the photodetector 26 to perform automatic light intensity adjustment
The laser beam that has passed through the half mirror 23a is
The light enters the motion block 19. For the prism block 19
Part of the incident light is reflected by the half mirror 19b,
Is reflected by the total reflection mirror 19a.
After passing through the phase spatial light modulator 17, a predetermined modulation
According to the turn, the phase of the light is spatially modulated and reproduced
Reference light. This reference light for reproduction passes through the convex lens 16.
The light converges. This reference light for reproduction is partially
Reflected by the half mirror 15a of the rhythm block 15,
It passes through the two-part optical rotation plate 14. Here, the split optical rotation plate 1
The light passing through the optical rotation plate 14L of No. 4 has a polarization direction of + 45 °.
The light is turned into A-polarized light and passes through the optical rotation plate 14R.
The passed light has its polarization direction rotated by -45 °, and the B-polarized light
It becomes. The reference light for reproduction that has passed through the two-part optical rotation plate 14 is
Irradiate the optical disc recording medium 1 through the objective lens 12
After convergence before the hologram recording layer 1c,
While passing through the hologram recording layer 1c. In FIG. 17 and FIG.
The symbol denoted by P represents P-polarized light, and the symbol denoted by reference numeral 82 denotes S-polarized light.
The symbol 83 represents A light, and the symbol 83 represents A-polarized light.
The symbol indicated by 84 represents B-polarized light. Figure 17
For reproduction through the optical rotation plate 14L of the two-part optical rotation plate 14.
The reference light 73L becomes A-polarized light, and is reflected by the objective lens 12.
Irradiates the optical disk recording medium 1 to record a hologram.
After convergence on the near side of layer 1c, hologram recording while diverging
It passes through the recording layer 1c. As a result, the hologram recording layer 1
c, the reproduction light corresponding to the information light 71L at the time of recording
74L occurs. The reproduced light 74L is transmitted through the objective lens 1
The laser beam of the parallel light flux is advanced to the side 2 by the objective lens 12.
And again passes through the split optical rotation plate 14 and becomes S-polarized light.
Become. Also, as shown in FIG.
The reference light for reproduction 73R that has passed through the optical rotation plate 14R of the plate 14 is
It becomes B-polarized light, and the optical disk is
Irradiated on the recording medium 1 and on the near side of the hologram recording layer 1c
After convergence, the hologram recording layer 1c
pass. As a result, recording is performed from the hologram recording layer 1c.
A reproduction light 74R corresponding to the information light 71R at the time is generated.
I do. The reproduced light 74R is directed toward the objective lens 12
The laser beam of the parallel light beam is
Then, the light again passes through the split optical rotation plate 14 and becomes S-polarized light.
You. The reproduction light that has passed through the two-part optical rotation plate 14 is
It enters the rhythm block 15 and part of it is a half mirror
15a. Reproduction through the half mirror 15a
The light is reflected by the total reflection mirror 15b, and all the pixels are turned on.
Passes through the spatial light modulator 18 and a part of the light
Reflected by the half mirror 19b of the
The light is incident on the CD array 20 and is recorded on the CCD array 20.
On / off pattern by the spatial light modulator 18 during recording
The light beam is imaged, and by detecting this pattern,
The information recorded on the disk recording medium 1 is reproduced. The modulation pattern of the recording reference light was changed.
Multiplexed information is recorded on the hologram recording layer 1c.
If there is a change in the reference light for recording,
The reproduction reference light with the same modulation pattern as the tone pattern
Only the read information is reproduced. 17 and 18
Then, the optical axis of the reference light for reproduction and the optical axis of the reproduction light are on the same line.
The irradiation of the reference light for reproduction and the collection of the reproduction light
The example is performed from the same side of the program recording layer 1c.
You. Further, a part of the reproduction light is used for servo during recording.
As in the case of the return light at
Incident on. Therefore, this four-segment photodetector 29
Using the light incident on the servo area 6 during reproduction,
To perform focus servo. In addition,
The raw reference beam is a hollow reference beam on the optical disc recording medium 1.
The hologram is recorded by converging once before the gram recording layer 1c.
Since the light is divergent in the recording layer 1c, the optical disc recording medium 1
Is reflected by the reflective film 1d and returns to the objective lens 12 side.
However, no image is formed on the quadrant photodetector 29. In practicing the present invention, an optical head
A laser beam for irradiating the optical disc recording medium 1 from the
For forming a hologram emitted from the laser light source 25.
Wavelength λTwoLaser beam and moving optical disk recording medium
A laser beam for forming a hologram
Irradiation position follows the time required for exposure, without displacement
To perform tracking servo control on the optical head
The servo clock pit SCK provided in the servo area 6
Irradiate 1-3 with a tracking laser beam, and the information recording position and
Optical beam with laser beam irradiation position for hologram formation
To detect displacement in the moving direction of the disk recording medium,
Wavelength λ emitted from laser light source 331Tracking laser beam
And the optical disk recording of the present invention.
The optical head 11 for the medium 1 has, for example, a wavelength λ1,wave
Long λTwoEmits coherent laser beams of multiple wavelengths
It is configured to be able to. The wavelength λ1, Wavelength λTwoCombination of multiple wavelengths
As λ1= 780 nm, λTwo= 532nm combination
Let λ1= 780 nm, λTwo= 650nm combination, λ1
= 650 nm, λTwo= 525 nm combination, λ1= 650
nm, λTwo= 405nm combination, λ1= 780 nm, λTwo
= 390 nm. In the device of FIG.
Apparatus provided with two laser light sources 25 and 33 having different wavelengths
However, instead of the two laser light sources, a single laser
Laser light source and wavelength selector by prism or diffraction grating
Laser beam of multiple wavelengths
Tunable laser light source device or laser beam
Exchange the wavelengths of light emitted from the laser beam source and the laser beam source.
Wavelength tunable laser light source using a nonlinear optical system
Can also be used. The hologram recording area of the optical disc recording medium 1
To record holograms sequentially in the information recording position of area 7
The laser beam for forming the hologram is used to
The recording medium 1 moves at least 200 μm in distance
The information recording position without causing a displacement
The hologram recording layer
It is necessary to settle the gram. Then, the optical disk recording medium 1 is 200 μm.
m, and when the recording of the hologram is completed, the optical head
In the direction opposite to the moving direction of the optical disc recording medium 1.
200 μm−α (where α is the distance between adjacent information recording positions)
Distance) suddenly returned and a new hologram in the same recording mode
In order to record the system at the next information recording position on the optical recording medium,
Go to the next information recording position with laser beam for hologram formation
Irradiation is started, and the optical disc recording medium 1 is moved by 200 μm.
During the movement, the information recording position is
Accurate holograph to information recording position while following with the beam
System recording. Such a hologram recording operation is performed in the following
This operation is sequentially repeated until the robot area is reached. Optical head
While passing through the servo area 6, the focus sensor
Control and tracking servo control are performed and the next sector
When you move to the information recording area,
The same hologram recording operation as above is repeated until the next sector
Holograms are sequentially recorded at the information recording position in the information recording area
Will be done. [0078] As described above, according to the present invention,
When recording a hologram in the hologram recording area,
A photo recorded on one track of the hologram recording area
On the program recording spot and the adjacent track
The hologram recording spot to be recorded
At least one track.
Two hologram recording spots are formed,
If hologram recording and playback operations are bursty
Instead, it is a continuous process. Moreover, the recording method of the present invention
According to this, the diameter of the hologram recording spot is D,
Adjacent when the multiplex number of gram recording spots is m
The pitch P between the hologram recording spots is P = D / m.
Record as follows. For this reason, the optical disk recording medium
Highly efficient recording of holograms in program recording area
To increase the density of hologram recording capacity
be able to.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram for explaining an optical disk recording medium used in an optical disk recording device according to one embodiment of the present invention. FIG. 2A is a partially enlarged view of FIG. 1; FIG. 2B is a partially enlarged view of FIG. 1; FIG. 3 is an enlarged partial sectional view of the optical disc recording medium. FIG. 4 is a graph showing a relationship between a spatial frequency of a pit and a transfer function (MTF). FIG. 5 is a diagram for explaining a conventional servo pit. FIG. 6 is a diagram for explaining servo pits formed on the optical disc recording medium. FIG. 7 is a diagram showing an arrangement relationship between each track and each frame of the optical disc recording medium and address information. FIG. 8 is a diagram for explaining a hologram recording format. FIG. 9 is a timing chart showing a recording pulse giving a timing at the time of recording. FIG. 10 is a diagram for explaining another embodiment of a hologram recording format. FIG. 11 is a diagram showing zones formed on the optical disc recording medium. FIG. 12 is a block diagram schematically showing a configuration of an optical disc recording / reproducing apparatus according to an embodiment of the present invention. FIG. 13 is a diagram showing a configuration of a part related to a tracking error detection circuit in a signal processing circuit of the device. FIG. 14 is a schematic view showing an example of an optical system of an optical head of the apparatus and showing a principle of an optical part of the optical head used in the apparatus. FIG. 15 is an explanatory diagram showing a state of a laser beam during recording. FIG. 16 is an explanatory diagram showing a state of a laser beam during recording. FIG. 17 is an explanatory diagram showing a state of a laser beam during reproduction. FIG. 18 is an explanatory diagram showing a state of a laser beam during reproduction. FIG. 19 is an enlarged partial cross-sectional view of a part of an optical disk recording medium using conventional volume holography. [Description of Signs] 1 ... Optical disk recording medium, 1a, 1b ... Transparent substrate, 1c
... recording layer, 1d ... reflective film, 1e ... substrate, 2 ... frame,
3 ... segment, 4 ... 5 ..., 6 ... servo area, 7 ... hologram recording area, 8 ... address area, 8a ... preamble, 8b ... synchronization mark, 8c ... address part, 8
d: End address mark, 8e: Post synchronization mark,
8f post amble, 10 optical disk recording / reproducing device, 11 optical head, 12 objective lens, 13 actuator, 14 split optical rotation plate, 15, 19, 23,
30 ... Prism block, 15a, 19b, 23a, 3
0a: half mirror, 15b, 19a: total reflection mirror,
16, 27 ... convex lens, 17 ... phase spatial light modulator, 18
... Spatial light modulator, 24, 32 ... Collimator lens, 2
5, 33 laser light source, 26, 31 photodetector, 28 cylindrical lens, 29 quadrant photodetector, 30a half mirror, 40 optical head,
41 spindle, 42 spindle motor, 43 spindle servo circuit, 44 driving device, 45 detection circuit, 46 focus servo circuit, 47 tracking servo circuit, 48 slide servo circuit, 49 signal processing circuit, 50 .., Controller 51, operation unit 52, tilt detection circuit 53, tilt correction circuit 54, follow-up control circuit 55, tracking servo circuit 61, differential amplifier 62
Multiplexer, 63 ... Comparator, 64 ... Logic operation circuit.

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Shoji Kinoshita             2-5-1 Shin-Yokohama, Kohoku-ku, Yokohama, Kanagawa             Optoware Corporation             Inside (72) Inventor Hozumi Tanaka             2-5-1 Shin-Yokohama, Kohoku-ku, Yokohama, Kanagawa             Optoware Corporation             Inside (72) Inventor Takao Yamamoto             2-5-1 Shin-Yokohama, Kohoku-ku, Yokohama, Kanagawa             Optoware Corporation             Inside F term (reference) 2K008 AA00 AA04 BB04 BB05 BB06                       CC01 CC03 DD13 FF07 HH06                       HH18 HH26                 5D090 AA01 BB20 CC01 CC04 DD03                       FF11 FF50 KK12 KK14

Claims (1)

  1. Claims: 1. A servo area for tracking servo, focus servo and clock generation of an optical head is discretely formed at predetermined intervals in a circumferential direction. At the time of recording, a hologram recording area, which is a mirror area, is formed. In the hologram recording area, an interference pattern caused by interference between the information light emitted from the optical head and the recording reference light is recorded as a hologram. In the recording method, a hologram recording spot recorded on one track of the hologram recording area and a hologram recording spot recorded on a track adjacent to the hologram recording area are recorded at different positions in a circumferential direction and are adjacent to each other. The pitch P between the hologram recording spots is set in advance by setting the diameter of the hologram recording spot to D. When the multiple number of holographic recording spots is m, the recording method of an optical disc recording medium characterized by recording the hologram recording spot on the hologram recording area such that P = D / m. 2. The distance between a hologram recording spot recorded on one track of the hologram recording area and a hologram recording spot recorded on a track adjacent thereto is substantially P, and A hologram is recorded in the hologram recording area such that a hologram recording spot recorded on the hologram and a hologram recording spot recorded on a track separated by m tracks from the hologram recording spot become equal in the circumferential direction. 2. The recording method of the optical disk recording medium according to 1. 3. An interval between a hologram recording spot recorded on one track of the hologram recording area and a hologram recording spot recorded on a track adjacent thereto is substantially P, and The hologram is recorded in the hologram recording area such that the circumferential position of the hologram recording spot recorded on the hologram recording spot and the hologram recording spot recorded on a track separated by m tracks are shifted by P / 2. Item 2. A recording method for an optical disk recording medium according to Item 1. 4. The optical disc recording medium is divided into a plurality of zones in a radial direction, and the number of hologram recording spots recorded in a peripheral direction of one hologram recording area in an outer peripheral zone is increased in an inner peripheral side. 4. A hologram is recorded in the hologram recording area so as to be larger than the number of hologram recording spots recorded in the circumferential direction of one of the hologram recording areas in a zone.
    The recording method for an optical disk recording medium according to any one of the above items. 5. A pit for clock generation is formed in the servo area, and a signal for determining a recording timing for each track is generated based on the pit for clock generation. 5. The recording method for an optical disk recording medium according to any one of claims 4 to 4. 6. A servo area for tracking servo, focus servo, and clock generation of an optical head is discretely formed at predetermined intervals in a circumferential direction, and between each servo area is a mirror area when not recording. A hologram recording area is formed, and the hologram is recorded on an optical disc recording medium in which an interference pattern caused by interference between information light emitted from the optical head and reference light for recording is recorded as a hologram. An optical disk recording apparatus that reads information on a servo area of the optical disk recording medium with the optical head and generates a clock; and determines a recording timing for each track based on the clock generated by the clock generating means. Recording timing generation means for generating a recording timing signal to be determined; Wherein the recording timing generating means records a hologram recording spot recorded on one track of the hologram recording area and a hologram recording spot recorded on a track adjacent thereto in different positions in a circumferential direction. And the pitch P between adjacent hologram recording spots
    Where D is the diameter of the hologram recording spot, and m is the preset number of multiplexed hologram recording spots.
    An optical disc recording apparatus, wherein the recording timing of the hologram in the hologram recording area is determined so that P = D / m. 7. A servo area for tracking servo, focus servo and clock generation of an optical head is discretely formed at predetermined intervals in a circumferential direction, and light is emitted from the optical head between each servo area. An optical disk reproducing apparatus for reproducing an optical disk recording medium on which a hologram recording area in which an interference pattern due to interference between an information light and a recording reference light is recorded as a hologram is provided. Clock generating means for generating a clock by reading the data at a time; and reproducing timing generating means for generating a reproduction timing signal for determining a reproduction timing for each track based on the clock generated by the clock generating means. Generating means on one track of the hologram recording area A hologram recording spot recorded on a track and a hologram recording spot recorded on a track adjacent to the hologram recording spot are recorded at different positions in the circumferential direction, and a pitch P between adjacent hologram recording spots is recorded.
    However, assuming that the diameter of the hologram is D and the number of multiplexed holograms set in advance is m, the reproduction timing of the hologram from the hologram recording area is determined so that P = D / m. An optical disc reproducing apparatus characterized by the following.
JP2001376433A 2001-12-10 2001-12-10 Optical disc recording method, optical disc recording apparatus and optical disc reproducing apparatus Expired - Fee Related JP4162886B2 (en)

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JP2005228416A (en) * 2004-02-13 2005-08-25 Pioneer Electronic Corp Hologram recording medium, recording and reproducing method, and recording and reproducing apparatus
WO2007114240A1 (en) * 2006-03-31 2007-10-11 Pioneer Corporation Optical information recorder/reproducer, optical information reproducer, and optical information recording/reproducing method
JP2008071405A (en) * 2006-09-13 2008-03-27 Toshiba Corp Optical recording medium and method of manufacturing the same and optical recording and reproducing device
JP2009170086A (en) * 2009-03-11 2009-07-30 Tdk Corp Holographic recording method and unit
JP2010097651A (en) * 2008-10-16 2010-04-30 Konica Minolta Opto Inc Optical pickup apparatus and recoding medium
JP2010225237A (en) * 2009-03-24 2010-10-07 Sony Optiarc Inc Light spot position controller and light spot position control method
US7983133B2 (en) 2008-04-25 2011-07-19 International Business Machines Corporation Portable data storage assembly having a holographic data storage layer and an optical tracking layer
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JP4574183B2 (en) * 2004-02-13 2010-11-04 パイオニア株式会社 Hologram recording medium
JP2005228416A (en) * 2004-02-13 2005-08-25 Pioneer Electronic Corp Hologram recording medium, recording and reproducing method, and recording and reproducing apparatus
JP4748817B2 (en) * 2006-03-31 2011-08-17 パイオニア株式会社 Optical information recording / reproducing apparatus, optical information reproducing apparatus, and optical information recording / reproducing method
WO2007114240A1 (en) * 2006-03-31 2007-10-11 Pioneer Corporation Optical information recorder/reproducer, optical information reproducer, and optical information recording/reproducing method
JP2008071405A (en) * 2006-09-13 2008-03-27 Toshiba Corp Optical recording medium and method of manufacturing the same and optical recording and reproducing device
US7852537B2 (en) 2006-09-13 2010-12-14 Kabushiki Kaisha Toshiba Optical recording medium and method of manufacturing the same
JP4621646B2 (en) * 2006-09-13 2011-01-26 株式会社東芝 Holographic data storage medium
US7983133B2 (en) 2008-04-25 2011-07-19 International Business Machines Corporation Portable data storage assembly having a holographic data storage layer and an optical tracking layer
JP2010097651A (en) * 2008-10-16 2010-04-30 Konica Minolta Opto Inc Optical pickup apparatus and recoding medium
JP2009170086A (en) * 2009-03-11 2009-07-30 Tdk Corp Holographic recording method and unit
JP4636189B2 (en) * 2009-03-11 2011-02-23 Tdk株式会社 Holographic recording method and apparatus
JP2010225237A (en) * 2009-03-24 2010-10-07 Sony Optiarc Inc Light spot position controller and light spot position control method
EP2387034A3 (en) * 2010-05-07 2011-11-30 General Electric Company System and method for improved data storage

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